Beyond Provable Security Verifiable IND-CCA Security of OAEP - Archive ouverte HAL Access content directly
Conference Papers Year : 2011

Beyond Provable Security Verifiable IND-CCA Security of OAEP

(1) , (2) , (3) , (1)
Gilles Barthe
  • Function : Author
  • PersonId : 962305
Benjamin Grégoire
Yassine Lakhnech
  • Function : Author
  • PersonId : 837979


OAEP is a widely used public-key encryption scheme based on trapdoor permutations. Its security proof has been scrutinized and amended repeatedly. Fifteen years after the introduction of OAEP, we present a machine-checked proof of its security against adaptive chosen-ciphertext attacks under the assumption that the underlying permutation is partial-domain one-way. The proof can be independently verified by running a small and trustworthy proof checker and fixes minor glitches that have subsisted in published proofs. We provide an overview of the proof, highlight the differences with earlier works, and explain in some detail a crucial step in the reduction: the elimination of indirect queries made by the adversary to random oracles via the decryption oracle. We also provide—within the limits of a conference paper—a broader perspective on independently verifiable security proofs.

Dates and versions

hal-01112084 , version 1 (02-02-2015)



Gilles Barthe, Benjamin Grégoire, Yassine Lakhnech, Santiago Zanella-Béguelin. Beyond Provable Security Verifiable IND-CCA Security of OAEP. Topics in Cryptology - {CT-RSA} 2011 - The Cryptographers' Track at the {RSA} Conference 2011, San Francisco, CA, USA, February 14-18, 2011. Proceedings, 2011, San Francisco, United States. ⟨10.1007/978-3-642-19074-2_13⟩. ⟨hal-01112084⟩
118 View
0 Download



Gmail Facebook Twitter LinkedIn More